with the FMIC, i say 20 is gonna be the max or so you'll be able to run on pump gas.. your engine sounds pretty strong so it should be able to take the boost. to run high boost on that thing you really will want a good engine management system so that you dont' blow that expensive engine.. keep the EGTs down, the knock down, and good timing, and you're all good.. jsut start easy and work up to the edge.. a little while on a dyno would be nice too.